The permeability of substances exhibiting this is 
The permeability of substances exhibiting this is given by the Stoletov Curve while certain combinations of copper, manganese and aluminium also exhibit this behavior. Only elements with partially filled electron shells, such as Gadolinium and Dysprosium, exhibit this behavior. Below a critical temperature a substance exhibiting this will undergo spontaneous magnetization, but above that critical temperature named for Curie, thermal motion in a substance causes its magnetic dipoles to lose their alignment and the substance to lose this property. For ten points name this "permanent" type of magnetism often compared with paramagnetism and diamagnetism.
The permeability of substances exhibiting this is given by the Stoletov Curve while certain combinations of copper, manganese and aluminium also exhibit this behavior.
{Ferromagnetism}